[jira] [Issue Comment Deleted] (HBASE-18042) Client Compatibility breaks between versions 1.2 and 1.3

["Gavin (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-18042?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gavin updated HBASE-18042:
--------------------------
    Comment: was deleted

(was: A comment with security level 'jira-users' was removed.)

> Client Compatibility breaks between versions 1.2 and 1.3
> --------------------------------------------------------
>
>                 Key: HBASE-18042
>                 URL: https://issues.apache.org/jira/browse/HBASE-18042
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver, scan
>    Affects Versions: 1.4.0, 1.3.1, 2.0.0
>            Reporter: Karan Mehta
>            Assignee: Duo Zhang
>            Priority: Critical
>             Fix For: 1.4.0, 1.3.2, 2.0.0
>
>         Attachments: HBASE-18042-branch-1-v1.patch, HBASE-18042-branch-1-v1.patch, HBASE-18042-branch-1.3-v1.patch, HBASE-18042-branch-1.3.patch, HBASE-18042-branch-1.patch, HBASE-18042-branch-1.patch, HBASE-18042-v1.patch, HBASE-18042-v2.patch, HBASE-18042.patch
>
>
> OpenTSDB uses AsyncHBase as its client, rather than using the traditional HBase Client. From version 1.2 to 1.3, the {{ClientProtos}} have been changed. Newer fields are added to {{ScanResponse}} proto.
> For a typical Scan request in 1.2, would require caller to make an OpenScanner Request, GetNextRows Request and a CloseScanner Request, based on {{more_rows}} boolean field in the {{ScanResponse}} proto.
> However, from 1.3, new parameter {{more_results_in_region}} was added, which limits the results per region. Therefore the client has to now manage sending all the requests for each region. Further more, if the results are exhausted from a particular region, the {{ScanResponse}} will set {{more_results_in_region}} to false, but {{more_results}} can still be true. Whenever the former is set to false, the {{RegionScanner}} will also be closed. 
> OpenTSDB makes an OpenScanner Request and receives all its results in the first {{ScanResponse}} itself, thus creating a condition as described in above paragraph. Since {{more_rows}} is true, it will proceed to send next request at which point the {{RSRpcServices}} will throw {{UnknownScannerException}}. The protobuf client compatibility is maintained but expected behavior is modified.



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